## 3D Gears Math

06 Aug 2015 Leave a comment

in 3D Printing, math Tags: gears

SO here is the information for making 3D gears that all fit together. I used Sketchup for the design. All the gear convexities and concavities are 3-inch half-circles.

**6-Spoke Gear**

12-sided circle

6-inch radius (12-inch diameter)

Rotated 7.5 degrees

24-sided circle

12-inch radius (24-inch diameter)

Rotated 15 degrees

**24-Spoke Gear**

48-sided circle

24-inch radius (48-inch diameter)

Rotated 3.75 degrees

12- by 24-inch rectangle

6-inch radius circles at ends

## Nettlesome

04 Aug 2015 Leave a comment

in ~some words Tags: nettlesome

Something that is annoying is nettlesome. The nettle plant stings. It is, by definition, nettlesome. See also bothersome, troublesome. (P.S. Where’s Charles?!)

## 3D Gears

04 Aug 2015 Leave a comment

in 3D Printing, math Tags: gears, Sketchup, Spirograph

After having discussions with my math peeps, I decided to make gears. From scratch, in Sketchup. Many failures ensued. Thankfully, a Youtube video showed me the light (granted, I had to watch the video about 20 times).

Anyway, the gear ratio works (don’t ask me what that means), and different sizes of gears spin with each other. I even got fancy with irregular shapes (see the long gear) as well as gears with cut-outs (to save filament) and a gear with holes (to create abstract designs a la Spirograph).

## Spinning Tree

04 Aug 2015 Leave a comment

in 3D Printing Tags: Makerbot, Sketchup, spinning, tree

This is a 3D printed tree that has movable branches.

I made it in Sketchup of simple geometric shapes, each rectangle just a wee bit smaller than the lower one.

The top part of the tree was actually a bit of challenge to create, as I had to create the triangle shape, but then make a partial hole through one side of it. There are three versions of it in the illustration above.

I exported each piece separately into Makerbot and then printed them one at a time.

Here are some more views of the tree.

## Bothersome

03 Aug 2015 1 Comment

in ~some words Tags: bothersome

A pest. A bother. An annoying person. See troublesome.